(Solved): The peptide group is planar, with only cis and trons conformations possible. Hydrogen bonding withi ...

The peptide group is planar, with only cis and trons conformations possible. Hydrogen bonding within elements of secondary structure stabilize certain atomic geometries. Only L-amino acids (except for glycine) are used in proteins. Although any one of

amino acids is possible at each position, only one is used. The tertiary structure of a protein is controlled by hydrophobic interactions between nonpolar amino acid residues.

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